The first known gun, and indeed the first known
finite pattern displaying infinite growth, found by Bill Gosper in
November 1970. This period 30 gun remains the smallest known gun in
terms of its bounding box, though some variants of the p120
Simkin glider gun have a lower population. Gosper later constructed
several other guns, such as new gun and the p144 gun shown under
factory. See also p30 gun.

Game of Life Explanation

The Game of Life is not your typical computer game. It is a cellular
automaton, and was invented by Cambridge mathematician John Conway.

This game became widely known when it was mentioned in an article
published by Scientific American in 1970. It consists of a grid of
cells which, based on a few mathematical rules, can live, die or
multiply. Depending on the initial conditions, the cells form various
patterns throughout the course of the game.

Rules

For a space that is populated:

Examples

Each cell with one or no neighbors dies, as if by solitude.

Each cell with four or more neighbors dies, as if by
overpopulation.